Above Average, the YouTube channel owned by Lorne Michaels’ Broadway Video, aims for viral success with “Homeland The Musical,” a video which, yes, imagines a Broadway version of the not at all song-and-dance-friendly Showtime thriller. It’s a familiar and solid joke (if barely a joke these days — “Big Fish” the musical is currently in previews), but here’s the real question — can it compete with the “Downton Abbey The Musical” parody? We’re thinking… not quite, though “I’ve got the guy right here / His name’s Abu Nazir” is pretty catchy.